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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c6abec13128d94d229521111961526ecd3a15d4f26bff88159e7e3d00cfc80' 
  AND token = 'dSV/mM1/H1eUp6n9L/bmmKf9dCKTU8ciT3+1RxoJ6Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}